pmem

The pmem driver is used to manage large (1-16+MB) physically contiguous
regions of memory shared between userspace and kernel drivers (dsp, gpu,
etc). It was written specifically to deal with hardware limitations of
the MSM7201A, but could be used for other chipsets as well. For now,
you're safe to turn it off on x86.

logger

logger - system logging facility

This is the kernel support for the 'logcat' command

The kernel driver for the serial devices for logging are in the source code drivers/android/logging.c